4-Digit Mental Addition and Subtraction Worksheet

Speed calculation lesson 16: Split and join: 4-digit sums · Set 205 · 40 questions

The fast method (Split and join): Split each 4-digit number into two 2-digit halves: 4768 → 47|68. Work out the left halves and the right halves on their own. Adding: a right half of 100 or more carries 1 to the left half. Subtracting: right half too small? Borrow 1 from the left half — it is worth 100 on the right.

1. 1.7518 − 1380 =
2. 2.8853 − 3158 =
3. 3.2865 − 2828 =
4. 4.4732 − 1826 =
5. 5.1619 + 8999 =
6. 6.6176 − 1691 =
7. 7.8980 − 3149 =
8. 8.6377 + 3319 =
9. 9.4451 − 3457 =
10. 10.3393 − 1697 =
11. 11.4792 − 4614 =
12. 12.3408 − 1882 =
13. 13.4838 − 3249 =
14. 14.4575 + 5028 =
15. 15.5286 + 4518 =
16. 16.7964 − 6465 =
17. 17.7492 + 1209 =
18. 18.5147 + 8873 =
19. 19.4963 − 3729 =
20. 20.7425 + 3831 =
21. 21.3221 + 5041 =
22. 22.7590 + 2509 =
23. 23.7630 − 2478 =
24. 24.1860 + 6005 =
25. 25.5417 − 1314 =
26. 26.8832 + 2679 =
27. 27.8588 − 4657 =
28. 28.5802 − 2427 =
29. 29.2374 + 1185 =
30. 30.8552 + 3249 =
31. 31.5518 − 5500 =
32. 32.2107 + 3548 =
33. 33.3110 − 1377 =
34. 34.8044 − 7188 =
35. 35.3258 + 2608 =
36. 36.4057 + 3816 =
37. 37.3050 + 5757 =
38. 38.3978 + 7533 =
39. 39.3284 + 1977 =
40. 40.2891 + 2223 =

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